Fuel mixing device



Sept 19, 1950 RBRoUssr-:AU x-:TAL 2,522,743

FUEL-MIXING DEVICE Filed March 13, 1947 IN VEN TORS Patented Sept. 19,1950 OFFICE 4 FUEL MIXING DEVI-CE I FredBrousseau, Schenectady, andPhilip J.

Brousseau, Peasleeville, N. Y.

Application March 13, i947, serial No. tease?,

This invention relates to -fuelmixing devices and more' particularlyto`an oil and air mixer. lt `istuan object of theinvention to provide aVmixing device which willcause a thorough commingling `of the oilandairto lproduce a highly combustible fuel mixture.` i j: A furtherobject of `the invention resides in injectingstreams of oil into an airline under pressure, the intersecting ow of oil and air resul'ring in abreaking up of the oil into small particles and a thorough mixing of theoil particles and air.

A still further object of the invention resides in providing a mixingdevice Whereinthe air supply for the fuel line serves to exert apressure on the oil supply to inject the oil into the air stream priorto its discharge from the burner nozzle.

It is also an object of the invention to provide an atomizer in the fuelline between the mixing device and burner nozzle to break the fuelmixture into a ne spray or mist before being discharged.

Other objects and advantages of the invention will be apparent duringthe course of the following description.

In the accompanying drawing forming a part of this specification andwherein like numerals are employed to designate like parts throughoutthe same,

Fig. 1 is a longitudinal sectional view of the mixing device and fuelline,

Fig. 2 is a section taken on line 2-2 of Fig. l, and

Fig. 3 is an enlarged section taken on line 3-3 of Fig. 1.

In the drawing wherein for the purpose of illustration a preferredembodiment of the invention is shown the numeral 5 denotes an oilholding chamber having an integral top wall 6 and removable bottomwall 1. The bottom wall has a marginal flange 8 having screw-threadedconnection with the Outer wall of the chamber, as`

at 9. The center of the bottom wall has a screwthreaded opening II)adapted to receive the lower end of `a mixing tube II extendingvertically of the chamber 5 to a point spaced from the top wall. An oilinlet I2 is :provided in the wall of the chamber intermediate its endshaving a pipe I3 leading therefrom to a suitable oil supply source. Oilis admitted into the chamber until the volume reaches a level just belowthe upper end of the tube II. An air inlet I4 is provided in the topwall 6 connected with a pipe I5 leading to a source of air underpressure. The upper end of mixing tube II has a valve seat I6 formedaolaims. (oizfnfss)A i ftherein for co-action with needle valve Il whichregulates the admission of air into the mixing tube.` The needle valveextends through the top `wall 6 and is threaded in a bushing I8 securedthe Wall. A hand knob I9 is formed integral with the outer end of theneedle valve for controlling the same to regulate the flow of air intothe mixing tube. The tube II adjacent its lower lendv is provided withdiametrically opposed orifices 26 and 2l for admitting oil into thetube. The orices have valve seats 22 and 23 formed therein for co-actionwith the needle valves 24 and 25 mounted in the wall of the chamber indiametrically opposed relation. The needle valves 24 and 25 arethreadedly mounted in bushings 26 and 21 and have hand knobs 2e and 29at their outer ends for adjusting the valves to control the flow of oilthrough the oriiices 2G and 2|. The bore of the tube II at its lower endis enlarged and screw-threaded, as at Btl, to receive the end of thefuel line 3| extending to the burner nozzle, not shown. A ball valve 32is in terposed in the fuel line which closes the line if any backpressure builds up in the line between the valve and burner nozzle. Anatomlizer tube as is connected in the line between the ball valve andburner nozzle and as shown in Fig. 3 consists of a solid body 34 havinga series of parallel longitudinal lpassages 35 therethrough which breakthe fuel mixture into a fine spray or mist.

In operation, the mixing chamber 51 holds a supply of oil introducedinto the chamber through inlet I2 while air under pressure is introducedinto the upper end of the chamber through inlet I4. The level of the oilin the chamber is maintained below the upper end of the mixing tube IIso the air entering the chamber is free to pass into the upper end ofthe mixing tube and ow therethrough. The flow of air into the mixingtube is regulated by the needle valve II which is manually adjustable.The oil under the pressure o-f air in the upper end of the chamber isforcibly ejected through the orifices 2! and 2l to intercept the streamof air flowing through the mixing tube. The flow of oil through orifices20 and 2| is regulated by needle valves 24 and 25 which are manuallyadjustable. The oil discharge orifices being diametrically opposed toeach other and at right angles to the flow of air through the mixingtube cause the oil to disintegrate into une particles and becomethoroughly mixed with the air. The mixture of air and oil fio-ws throughthe fuel line 3| and passes through an atomizer 33 before it reaches theburner.. The ball valve 32 cheat@ 3 serves to close the fuel line shoulda back pressure occur in the line between the valve and burner.

It is to be understood that the form of our invention herein shown anddescribed is to be taken as a preferred example of the same and thatchanges in the shape, size and arrangement of the parts may be madeWithout departing from the spirit of the invention or the scope of thesubjoined claims.

Having thus described our invention, we claim:

1. A fuel oil and air mixing device comprising a chamber adapted tocontain a supply of fuel oil, a mixing tube disposed centrally of saidchamber having its upper end opening into the chamber above the level ofthe oil, said tube having a valve seat in its upper end anddiametrically opposed orifices with valve seats ad#- jacent its lowerend,` `a fuel line leading from the lower end of said mixing tube, anair supply v.conduit connected to the upper endrof said chamber `forsupplyingv a continuous stream of air under pressure to the chamberabove the level Of the fuel oil, a valve member co-acting with the valveseat in the upper end of said mixing tube for regulating the 110W of airthroughrsaid tube, and valve members co-acting with the valve seats ofthe orifices in the lower end of said tube for l regulating the opposedstreams f oil forcibly ejected from the orices across said tube throughthe stream of air passing therethrough whereby the oil is broken intofine particles for thorough mixing with the stream of air.

2. A device as described in claim 1 including a fuel atomizer connectedto said fuel line consisting of a Vsolid body having a series ofparallel longitudinal passages therethrough.

3. A device as described in claim 1 including a fuel atomizer connectedto said fuel line and a ball valve interposed in the fuel line actuatedby the back pressure to close said fuel line.

FRED BROUSSEAU. PHILIP J. BROUSSEAU.

REERENCES CITED .The following references are of recordr in the le ofthis patent:

lNumber Name Date K 418,582 Monsanto Dec. 31, 1889 1,118,237 Saint-@vifyNov. 24, 1914 1,832,503 Rasmussen Nov. 17, 1931 2,054,734 Akast et al.Sept. l5, 1936 2,067,412 Pickup Jan. 12, 1937

